Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
New accounting pronouncements or change in accounting principle
Lease, Practical Expedients, Package	true
Lease, Practical Expedient, Lessor Single Lease Component	true
Operating lease, right-of use assets	$ 312
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets..
Operating lease liabilities	$ 312
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities.
ASU 2016-02
New accounting pronouncements or change in accounting principle
Change in Accounting Principle, Accounting Standards Update, Adopted		true
ASU 2016-02 | Adjustment
New accounting pronouncements or change in accounting principle
Operating lease, right-of use assets		$ 400
Operating lease liabilities		$ 400